hello , yesterday i i humped some pillow and matresses naked "masturbated "and after i finished i felt asleep and next day i found a area of blood on my under wear ,and my penis was injured with trace blood on it !!! i was wandering why this has happened to me although nothing sharp i came into contact with it was only some friction with that pillow and mattresses , and when i revealed the cover and mttresses i found an old dirty scissors were under my cover i thought this was the cause of such injury , can this lead to HCV or HIV ! and thanks